Template:On this day/June 18
- 1812 – War of 1812: The United States declared war against England.
- 1878 – Congress approved a $20,000 appropriation to improve Pensacola Bay, including the removal of several shipwrecks near the entrance.
- 1918 – Oscar S. Willenzik was born.
- 1931 – Grier Williams was born.